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Hello,This issue may becaused by poor connection. Check to see if all interface connection cables arein the printer. If the printer doesn't establish good connection with thecomputer print quality will decrease.Second thing you can check are thesettings on the computer. Are they matching with settings in Brother MFC-9840CWD.This is issue is not caused from the toner cartridge or drum unit.

A quick fix for most communication errors can be achieved by
resetting the printer and/or rebooting the PC. Simply disconnect the printer
from your computer (if USB connected)> reboot your pc > unplug and
re-plug the printer into the power source to reset it. When the printer turns
on, reconnect it to your computer (if USB connected). Then try to print again
once the computer fully recognizes the USB connection or when the WiFi light on
the printer turns solid green (if WiFi connected.).

If that doesn't help, try the steps below:

Disconnect the USB cable
connecting the printer from your computer.

On your computer, go to Control
Panel > Printers and Faxes.

Delete the Lexmark print
object.

Reboot computer.

Re-brick your printer by
pulling out the power supply - black box where the power cord is plugged
into on the back of the printer, and re-plug after 30 seconds.

When the printer turns on,
reconnect it to the computer.

Wait until your computer fully
recognizes the USB connection. To check, go to Control Panel > Printers
and Faxes. If you see a new Lexmark print object in the list, try to print
a document to verify that the problem is fixed.

Its not a net work printer, they how you are connected this printer for all computers & laptops?. It might be connected to one system from there its shared..right. In this situation if any computer fired print command it has to reach the local computer where printer connected. If the local computer shut down, printer unable to print due to no print command.. or else if any net work related issue with in your systems you wont get prints.. Find out were you are stuck. If printer is printing well from the local system you cannot suspect the printer. Just you start from local system, then check in all systems. Pl get back to us for further remedies..best of luck..

A quick fix for most communication errors can be achieved by
resetting the printer and/or rebooting the PC. Simply disconnect the printer
from your computer (if USB connected)> reboot your pc > unplug and
re-plug the printer into the power source to reset it. When the printer turns
on, reconnect it to your computer (if USB connected). Then try to print again
once the computer fully recognizes the USB connection or when the WiFi light on
the printer turns solid green (if WiFi connected.).

If that doesn't help, try the steps below:

Disconnect the USB cable
connecting the printer from your computer.

On your computer, go to Control
Panel > Printers and Faxes.

Delete the Lexmark print
object.

Reboot computer.

Re-brick your printer by
pulling out the power supply - black box where the power cord is plugged
into on the back of the printer, and re-plug after 30 seconds.

When the printer turns on,
reconnect it to the computer.

Wait until your computer fully
recognizes the USB connection. To check, go to Control Panel > Printers
and Faxes. If you see a new Lexmark print object in the list, try to print
a document to verify that the problem is fixed.

A quick fix for most communication errors can be achieved by
resetting the printer and/or rebooting the PC. Simply disconnect the printer
from your computer (if USB connected)> reboot your pc > unplug and
re-plug the printer into the power source to reset it. When the printer turns
on, reconnect it to your computer (if USB connected). Then try to print again
once the computer fully recognizes the USB connection or when the WiFi light on
the printer turns solid green (if WiFi connected.).

If that doesn't help, try the steps below:

Disconnect the USB cable
connecting the printer from your computer.

On your computer, go to Control
Panel > Printers and Faxes.

Delete the Lexmark print
object.

Reboot computer.

Re-brick your printer by
pulling out the power supply - black box where the power cord is plugged
into on the back of the printer, and re-plug after 30 seconds.

When the printer turns on,
reconnect it to the computer.

Wait until your computer fully
recognizes the USB connection. To check, go to Control Panel > Printers
and Faxes. If you see a new Lexmark print object in the list, try to print
a document to verify that the problem is fixed.

A
quick fix for most communication errors can be achieved by resetting the
printer and/or rebooting the PC. Simply disconnect the printer from your
computer. Reboot your pc. Unplug and re-plug the printer into the power source
to reset it. When the printer turns on, reconnect it to your computer. Then try
to print again once the computer fully recognizes the USB connection.

If
that doesn't help, try the steps below:

1.
Disconnect the printer from your computer.

2.
Rebrick (pull out power supply, black box where the
power cord is plugged in at the back of the printer, and put it back after 30
seconds).

2.
On your computer, go to Control Panel > Printers and Faxes.

3.
Delete the Lexmark print object.

4.
Reboot your pc.

5.
When your pc turns on, reconnect the printer.

6.
Wait until your pc fully recognizes the USB connection. To check, go to Control
Panel > Printers and Faxes. If you see a new Lexmark print object in the
list, then try to print a document again to verify that the problem is fixed.

A
quick fix for most communication errors can be achieved by resetting the
printer and/or rebooting the PC. Simply disconnect the printer from your
computer. Reboot your pc. Unplug and re-plug the printer into the power source
to reset it. When the printer turns on, reconnect it to your computer. Then try
to print again once the computer fully recognizes the USB connection.

If
that doesn't help, try the steps below:

1.
Disconnect the printer from your computer.

2.
Rebrick (pull out power supply, black box where the
power cord is plugged in at the back of the printer, and put it back after 30
seconds).

2.
On your computer, go to Control Panel > Printers and Faxes.

3.
Delete the Lexmark print object.

4.
Reboot your pc.

5.
When your pc turns on, reconnect the printer.

6.
Wait until your pc fully recognizes the USB connection. To check, go to Control
Panel > Printers and Faxes. If you see a new Lexmark print object in the
list again, then try to print again.

Try purging your temp files. If it's a usb connection try a different usb port. Since it can print from scan and do a test nozzle print then it's not getting data from the pc to the printer. If a different port doesn't work either, and if purging your temp files doesn't work try it on a different computer if possible. You may need to reinstall the driver for it.

oh and make sure you don't end up with one of those 'oh duh' moments :) ... check both ends of the cable to make sure it didn't become loose or unplugged :)

The Driver for Your Product Is Included in the Windows 7 Operating System (i.e. Win 7-32bit & 64bit).Simply connect the printer to your computer with a USB cable, and Windows Update automatically installs the driver for your product.